Mwangi, Esther; Dohrn, Stephan(CGIAR System-wide Program on Property Rights and Collective Action, International Food Policy Research Institute, Washington, DC, 2006)
Ngakan, Putu Oka; Achmad, Amran; Wiliam, Dede; Lahae, Kahar; Tako, Achmad(Center for International Forestry Research (CIFOR), Bogor Barat, Indonesia, 2005)